My boyfriend cheated on me with my cousin!! What do u think I should do?

My boy is cheating on me with my cousin and we just kissed last night. I love him and he told me he wanted to spend his life with me. He also told my cousin he loved her. Is he lying to me or my cousin? HELP!!!
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My brother just found out and he kissed me in a apartment bed when he forced me to sleep and have sex with him. Now what do I do? HELP
My boyfriend cheated on me with my cousin!! What do u think I should do?
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